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Heavy Elements: The term heavy metal refers to any metallic chemical element that has a relatively high density and is toxic or toxic at low concentrations. Examples of heavy metals include mercury (Hg), cadmium (Cd), arsenic (As), chromium (Cr), thallium (Tl), and lead (P). Heavy metals are natural elements of the Earth's crust. Heavy Metal: A metal characterized by its relatively high atomic mass. This term is usually applied to common transition metals, such as copper, lead, and zinc. These metals cause environmental pollution (heavy metal pollution) from a number of sources, including lead in gasoline, industrial waste, and the leaching of metal ions from soil into lakes and rivers due to acid rain. However, this term can also be applied to some metals and light non-metals, which are also toxic. Heavy metals are also characterized by a specific weight greater than 5.0. Heavy metals include some nonmetals, transition metals, basic flutes, lanthanides, and actinides. Mercury, bismuth, and lead, for example, are toxic metals with a sufficiently high density. Examples of heavy metals also include lead, mercury, cadmium, and sometimes chromium. Metals such as iron, copper, zinc, aluminum, beryllium, cobalt, manganese, and arsenic can also be considered heavy metals.